Problem with PlayerPrefs?

Question

Unity

Hello, I was saving the inventory and I encountered such a problem that when an item is thrown away, for some reason, the save goes through and the item, after being thrown out, goes to the next free slot.
Here is the code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class sobiraenpredmetu : MonoBehaviour
{
    private inventoryipob inventoey;
    public GameObject slotButton;
    public int id;



    private void Start()
    {
        inventoey = GameObject.FindGameObjectWithTag("Player").GetComponent<inventoryipob>();

        if (PlayerPrefs.HasKey("slots"))
        {
            for (int i = 0; i < inventoey.slots.Length; i++)
            {
                if (PlayerPrefs.GetInt($"сохраняем слот{i}") == i)
                {
                    
                    if (inventoey.idfull[i] == false)
                    {

                        if (id == PlayerPrefs.GetInt($"slots{id}"))
                        {
                            Instantiate(slotButton, inventoey.slots[i].transform);

                            
                            inventoey.idfull[i] = true;
                            break;
                        }
                    }
                    
                }

            }
        }


    }
    private void OnTriggerEnter2D(Collider2D other)
    {
        if (other.CompareTag("Player"))
        {

            for (int i = 0; i < inventoey.slots.Length; i++)
            {
                if (inventoey.idfull[i] == false)
                {
                    inventoey.idfull[i] = true;
                    Instantiate(slotButton, inventoey.slots[i].transform);
                    Destroy(gameObject);
                    PlayerPrefs.SetInt($"slots{id}", id);
                    PlayerPrefs.SetInt($"сохраняем слот{i}", i);
                    Debug.Log(PlayerPrefs.GetInt($"slots{id}", id) + " = id");
                    Debug.Log(PlayerPrefs.GetInt($"сохраняем слот{i}", i) + " = i");
                    break;
                }

            }
        }
    }
    
}

I don’t understand why this is so and I ask you to explain what’s going on, preferably in detail, since I’m new to the topic of saving.

Changed :
Script 1 :

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class vubros : MonoBehaviour
{
    
    public GameObject item;
    private Transform player;
    
    private void Start()
    {
        player = GameObject.FindGameObjectWithTag("Player").transform;
        
    }
    public void spawnDropedItem()
    {
        Vector3 playerPos = new Vector3(player.position.x + 3, player.position.y + 1,9);
        Instantiate(item, playerPos, Quaternion.identity);
    }

}

Script 2:

using System.Collections.Generic;
using UnityEngine;

public class slots : MonoBehaviour
{
    private inventoryipob inventoey;
    
    public int i;

    private void Start()
    {
        inventoey = GameObject.FindGameObjectWithTag("Player").GetComponent<inventoryipob>();
    }
    private void Update()
    {
        if(transform.childCount <= 0)
        {
            inventoey.idfull[i] = false;
        }

    }
    public void DropItem()
    {
        foreach(Transform child in transform)
        {
            child.GetComponent<vubros>().spawnDropedItem();
            GameObject.Destroy(child.gameObject);
        }
    }

}

using System.Collections;